Improvement in saws



tiniidr g Hiatt aan aaa,

HENRY DIs'sTON AND THOMAS OAEEs HILL, OE PHILADELPHIA, PENNsYL VANIA, AssIeNOEs To HENRY DIssTON a SON, OE SAME `rLA'oE.

Letters Patent No; 111,619, dated February '7, 1871.

lMPRovEMEnT 1N sAws.

,The Schedule referred to in these Letters Patent and making part' of the same.

Nature and Object of the' Intention; Our invention consists in an improvement in hands-aws, too fulTy described hereafter to need preliminary explanation.

Description of thc Accompanying Drawing.

The ligure in the accompanying drawing is a side view of our imp roved hand-saw.

' General Description..

vbestobserved on reference; to Figure 1, in'which the teeth c a'are similar to those of a common saw, while the teeth b are similar to'those of a rip-saw, the front edge f of -each of these teeth being at right angles or thereabout to the edge ot' the blade, while the rear edge h has a greater inclination than the edgesof the common teeth a.

Adjacent .to each of the ripping-teeth bis a tooth, Ii, which may be termed a combination oi' a ripping and a common tooth.

Itis not essential that the ripping-teeth should be interposed among the ordinary teeth precisely in the manner shown, or that theyshould be of the precise shape specified, as any of the ripping-teeth now in use may be combined-with the common teeth. lt is to be preferred, however, 'that the ripping-teeth should be fewer in number than the common teeth.

A saw having teeth arranged substantially as described possesses all the advantages of a common saw, while it can be used with great effect as a ripsaw.

.Another advantage possessed by the teeth arranged as described is, that one le will serve to sharpen both the ordinaryand ripping-teeth.

The second part of our improvement consists in rounding the cutting-.edge of a hand-saw at andnear the'out-er end of the blade, as shown in the drawing, which also illustrates' the advantage of this part of my invention.

We will suppose the line a: to represent the floor of a room, the line y being the wall and the projection t the skiitiug, which we will suppose it to be necessary to sever. rlhe difculty of cutting this skir'ting with an Ordinary hand-saw having -a continuous straight cutting-edge will be readily understood, and the facility with which the same duty can be accomplished by a saw rounded at and near the outer end of the blade will also be understood-without explanation otherthan that afforded bythe illustration.

It Awill be understood that the end of the blade is beveled, as shown, soasA to permit the above use of the rounded edge.

' Many other instances .in which this improvement will prove of great. advantage will readily suggest themselves to those familiar with the use of handsaws.

rlhe teeth at this rounded portion of the edge of the saw may be of the ordinary character, and it may be advisable to make them somewhat ner'thau' the other teeth of the saw.

,Another advantageoi our improvement may be explained as follows:

In using an ordinary saw, especially for ripping purposes, the blade frequently escapes from the cut in the lumber, into which cut the blade must be reinserted.

These accidents' result in more or less delay in the operation of sawing, and cause much annoyance to the operator.

The rounded edge at 'and near lthe outer 'end of the blade will in a great measure bviate this didiculty, as the blade thus formed is not so likely to leave the out or to be buckled as the blade of al1-Ordinary handsaw.

On the downward stroke of the saw the tapering outer end of the blade serves as a guide'to direct the saw-in its outer course.

It may be remarked that, as regards the thickness of the blade, the latter has the usual gradual taper from the handle," where it is thickest, to its outer end.

lhe blade has also the usual taper from thecuttingedge, where itis thickest, to the rear edge.

Claim.

,this specification inthe presence of two subscribing witnesses.

HENRY DISSTON. THOMAS GATES HILL.

`Witnesses: --'A. H. SHOEMAKER, HARRY SMITH. 

